[Of the bat] The bat, a lowly animal, gets its name from vesper, the evening, when it emerges. It is a winged creature but also a four-footed one, and it has teeth, which you would not usually find in birds. It gives birth like a quadruped, not to eggs but to live young. It flies, but not on wings; it supports itself by making a rowing motion with its skin, and, suspended just as on wings, it darts around. There is one thing which these mean creatures do, however: they cling to each other and hang together from one place looking like a cluster of grapes, and if the last lets go, the whole group disintegrate; it a kind of act of love of a sort which is difficult to find among men.